Books like no. 6

No. 6 (ナンバー・シックス) is a nine-volume novel series written by Atsuko Asano and published by Kodansha between October 2003 and June 2011. A manga adaptation drawn by Hinoki Kino began serialization in the March 2011 issue of Kodansha's Aria magazine. An anime television series adaptation by Bones began airing in Japan in July 2011.

The story takes place in a dystopian city known as "No.6". Shion, a boy raised in the elite and privileged environment of his home, gives shelter to another boy, who only gives his name as "Nezumi" (or "Rat") on the former's twelfth birthday. What Shion soon discovers is how drastically life will change after meeting with the mysterious Nezumi, with whom he had shared one unforgettable, stormy night.